<template>
  <el-container class="home-container">
    <!-- 头部区域-->
    <el-header>
      <div>
        <img src="../assets/logo.png" alt="logo">
        <span>后台管理系统</span>
      </div>
      <el-button type="info" @click="logout">退出</el-button>
    </el-header>
    <!-- 页面主体-->
    <el-container>
      <el-aside :width="isCollapsed ? '64px' : '200px'">
        <div class="toggle-button" @click="toggleCollapse">|||</div>
        <el-menu background-color="#333744" text-color="#fff" active-text-color="#409EFF"
                 :unique-opened="true" :collapse="isCollapsed" :collapse-transition="false"
                 :router="true" :default-active="activatePath">
          <!-- 一级菜单-->
          <el-submenu :index="item.id + ''" v-for="item in menuList" :key="item.id">
            <template slot="title">
              <i :class="iconsObj[item.id]"></i>
              <span>{{ item.authName }}</span>
            </template>
            <!-- 二级菜单-->
            <el-menu-item :index="'/' + subItem.path" v-for="subItem in item.children" :key="subItem.id"
                          @click="saveNavState('/' + subItem.path)">
              <template slot="title">
                <i class="el-icon-menu"></i>
                <span>{{ subItem.authName }}</span>
              </template>
            </el-menu-item>
          </el-submenu>
        </el-menu>
      </el-aside>
      <!-- 右侧内容主体 -->
      <el-main>
        <!-- 路由占位符 -->
        <router-view></router-view>
      </el-main>
    </el-container>
  </el-container>
</template>

<script>
export default {
  data() {
    return {
      menuList: [],
      iconsObj: {
        1: 'iconfont icon-user',
        2: 'iconfont icon-tijikongjian',
        3: 'iconfont icon-shangpin',
        4: 'iconfont icon-danju',
        5: 'iconfont icon-baobiao'
      },
      isCollapsed: false,
      // 被激活的连接地址
      activatePath: ''
    }
  },
  created() {
    this.getMenuList();
    this.activatePath = window.sessionStorage.getItem('activatePath')
  },
  methods: {
    logout() {
      window.sessionStorage.clear();
      this.$router.push('/login')
    },
    // 获取菜单数据
    async getMenuList() {
      const { data: res } = await this.$http.get('menus');
      console.log(res)
      if (res.code !== 200) {
        return this.$message.error(res.data.msg)
      }
      this.menuList = res.data;
    },
    // 点击按钮，实现折叠
    toggleCollapse() {
      this.isCollapsed = !this.isCollapsed;
    },
    // 保存连接激活状态
    saveNavState(activePath) {
      window.sessionStorage.setItem('activePath', activePath)
      this.activatePath = activePath
    }
  }
}
</script>

<style lang="less" scoped>
.home-container {
  height: 100%;
}

.el-header {
  background-color: #373D41;
  display: flex;
  justify-content: space-between;
  padding: 0;
  align-items: center;
  color: #fff;
  font-size: 20px;

  > div {
    display: flex;
    align-items: center;

    span {
      margin-left: 15px;
    }
  }
}

.el-aside {
  background-color: #333744;
  .el-menu {
    border-right: none;
  }
}

.el-main {
  background-color: #eaedf1;
}

.iconfont {
  margin-right: 10px;
}

.toggle-button {
  background-color: #4a5064;
  font-size: 10px;
  line-height: 24px;
  color: #fff;
  text-align: center;
  letter-spacing: 0.2em;
  cursor: pointer;
}
</style>
